Or vice versa.
Yes, you had that backwards.
12v is 5521
9v is 5525
My cable came with a battery during a YSale purchase so I can not really suggest a cable and I don't know who made it. Tip to tail its 21", right angle, 5521 for 12v. Never run my MP6ii any other way actually, but I am in the minority as most of the other members with the same battery/deck combo run USB to USB-C right angle.